unit 1-mass and change
TRANSCRIPT
Unit 1- Mass and Change
What could we have measured?
Mass
What is mass?
How can it be measured?
Mass and Change Lab
Mass and Change Lab Rubric
Mass and Change Lab
• Goal- What happens to the mass of objects when they are changed?Part 1: Change the shape of steel woolPart 2: Melting icePart 3: Burning steel woolPart 4: Dissolved sugar in waterPart 5: Dissolved Alka-Seltzer
Mass and Change Lab Rubric
Example Set Up
Part 1 Data:
Part 1 Evaluation:
Prediction-Mass Before Mass After
Change
Particle DiagramBefore After
Part 1 Procedure:
Conservation of Mass Notes
Law of Conservation of Mass
• This law was developed by a French chemist named Antoine Lavoisier. • Lavoisier carefully measured the
mass of the reactants and products when carrying out chemistry experiments. • He noticed that in every case,
the mass of the reactants was ALWAYS equal to the mass of the products.
• Historical Context- Year was 1776.– He was the first scientist to recognize and name the elements hydrogen and
oxygen.– In 1789, he wrote the first
chemistry textbook. • Oxygen, nitrogen, hydrogen, phosphorus, mercury, zinc and sulphur (list also included 'light' and 'caloric‘).
– He was executed, along with hundreds of other nobles, during the French Revolution.
Law of Conservation of Mass
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction, it is conserved.
The mass of the reactants equals the mass of the products.
massreactants = massproducts
Law of Conservation of Mass
White Boarding Session
• Each lab table will be assigned one experiment from lab.• On the whiteboard collaboratively draw a particle diagram that
illustrates the law of conservation of mass for your assigned part. • Assign one person to explain the drawing and the other members
need to be ready to answer questions from their classmates/teachers.
Conclusion Questions